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I'm looking into learning C basics and syntax before beginning Systems Programming next month. When doing some reading, I came across the C89/99 standards. According to Wikipedia, C99 introduced several new features, including inline functions, several new data types (including long long int and a complex type to represent complex numbers), variable-length arrays, support for variadic macros (macros of variable arity) and support for one-line comments beginning with //, as in BCPL or C++. Many of these had already been implemented as extensions in several C compilers. C99 is for the most part backward compatible with C90, but is stricter in some ways; in particular, a declaration that lacks a type specifier no longer has int implicitly assumed. A standard macro STDC_VERSION is defined with value 199901L to indicate that C99 support is available. GCC, Sun Studio and other compilers now support many or all of the new features of C99. I borrowed a copy of K&R, 2nd Edition, and it uses the C89 standard. For a student, does the use of C89 invalidate some subjects covered in K&R, and if so, what should I look out for?

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